STOCKHOLDER'S EQUITY (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended				12 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2018
Equity [Abstract]
Balance at the beginning of period		$ 2	$ 2	$ 2		$ 4		$ 0	[1]
Other Comprehensive Income (Loss), Gain (Loss) on Derivatives Qualifying as Hedges, Net of Tax		(2)	(5)	(2)	[2]	(7)	[2]
Reclassification of net loss relating to interest rate cash flow hedges from AOCI to interest expense, net of tax		1	1	1		0
Unrealized gains on available-for-sale securities, net of tax		1	1	1		1
Balance at the end of period (a) (b)	[1]	$ 0	$ (3)	$ 0		$ (3)
Expectation
Portion expected to be reclassified from AOCI to interest expense during the next twelve months								2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax								$ 1

[1] Includes unrealized gains on available-for-sale securities, net of tax, of less than $1 million for the three and six months ended June 30, 2017 and 2016.

[2] Includes reclassification of net loss relating to interest rate cash flow hedges from AOCI to earnings, net of tax, of less than $1 million for the three and six months ended June 30, 2017 and 2016. The reclassification is reported in interest expense on a pre-tax basis.